| himomo |
2015-10-08 09:15 |
如何解含參量的定積分并作圖
matlab未系統(tǒng)學(xué)過，已困惑了許久，希望得到高手、老師的幫助！積分函數(shù)如圖片所示。 bDRl}^a O6
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我采用了dblquad函數(shù)來進(jìn)行積分，將待積函數(shù)設(shè)了一個(gè)function函數(shù) 5V8W SnO
Nn>Oq+:
function y=E_x(r,PHI,z) c#Y/?F2p
omega0=7.57e15; #,lJ>mTe4
c=3e11; G,3.'S,7
k=omega0/c; xbsp[0I,
A=@(phi,theta)exp(i*k*(z.*cos(theta)+r.*sin(theta).*cos(phi-PHI))).*cos(theta).*cos(phi); PS**d$ S
y=dblquad(A,0,2*pi,0,1.12); l*^c?lp)
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然后直接調(diào)用該函數(shù)： /{|JQ'gqX
lambda=2*pi/k; tP^2NTs%]
for z=0:1:2; lXjh T
r=linspace(-2*lambda,2*lambda,201); LB$#]
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HI=linspace(0,2*pi,201); n Hz Xp:"
[rho,PHI ]=meshgrid(r,HI); E.45 s? r
Ie=conj(E_x(rho,PHI,z)).*E_x(rho,PHI,z); 5LM
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